Brake-shoe.



C. W.- ARMBRUST.

BRAKE SHOE.

APPLICATION FILED MAB. 8, 1911'.

Patented NOV. 28, 1911.

UNITED STATES PATENT o'nnron.

CHARLES W. AIBJMBRUST, 0F CRYSTAL LAKE, ILLINOIS, ASSIGll'OlR 0FONE-FOURTH TO SYDNEY STEIN, OF CHICAGO, :ILLINOIS. 4

BRAKE-SHOE.

To all whom alt-may concern; I

that I, CHARLES W. Anar- Be 'it known BRUsT, a citizen of the UnitedStates, re-

siding at Crystal Lake, in the county of;

- ent application constitutes a division of my copending application,Serial No. 603,268, filed January 18th, 1911.

One of the novel features of my present invention resides in theconstruction wherein the interlocking parts on the back and face of theshoes, respectively, are constructed to be engaged in interlockingrelation by moving one of the shoes transversely relatively to the otherand the shoes are so shaped that when interlockingly engaged the centralportions of-the interlocked shoes are spaced apart while the endportions thereof are in engagement with each other.

By reason of this construction the interlocking recesses with which theface of the shoe is provided may be made of minimum depth therebyenabling the greatest amount of material to be incorporated in a shoe ofa predetermined thickness.

. Another feature and object of my invention-is the provision of a shoehaving locking means disposedoutside the ends of the {end prongs of abrake-head for locking the shoes together, this position of the lockingL -means enabling the shoes to be securely locked together .attheirends. I

Another novel and advantageous feature of the invention resides in thearrangement of the locking lugs and cooperating locking recesses so thatwhen the shoes are interlockingly engaged they i will be held againstrelatively transverse movement tending to disengage the locking means,as well as against separation.

Specification of Letters Patent.

,of the shoe shown in Fig. 2;

Patent d Nov. 28, 1911.-

Original application filed January 13, 1911-, Serial No. 603,268.Divided and tl i'i'sfapplication filed March 8, Serial No. 613,009.

. Other objects and advantages of the present invent on Wlll be apparentfrom the following description and accompanying drawings throughout thevarious views of which like reference characters" refer to similarparts.

Referring to the drawings-Figure 1 is a side elevation ofashoe'embodying one preferred form of my invention. Fig. 2 1s a backview of the shoe with the detachable holding lug removed. Fig. 3 is aface view and Fig. 4 is a sectional elevationon the line'4 4.of

Fig. 1.

On the drawings 5 designates the main body of a. shoe of general curvedformation, the -curvature of the face of the shoe being 8 that when twoshoes are interlockingly engaged the back and face of the interlockedshoes will be spaced apart intermediate their ends.

In order to maintain the proper reater than the curvature of the back sospacing of the adjacent back and face of the 7' interlocked shoes eachback is provided on either side of the center with transversely disposedspacing lug's 6' arranged in parallel relation at right angles to thelongitudinal axisof the shoe and spaced apart aproper 8b distance tosnugly engage the outer ends of the brake head attaching prongs for thepurpose of preventing torsional or twisting movement of the shoerelatively to the head whereby the shoe is maintained in alinement.

A central locking stud '7 is formed at the center of the back of theshoe, theends of the stud lying parallel with the longitudinal faces ofthe shoe being undercut, as indicated at '8, for interlockln adetachable holding or astenlng lug 9 by means of which-the shoe isattached to the I brake head,

When the shoe is to'be mounted the atlug- 8, by movement longitudinallyof the shoe, whereupon the shoe may be secured in position by passingthe ordinary locking key through the brake head attaching prongs andbeneath a depression 10'being of the locking lug 7 the key. 1

It will be understood that the attaching provided in the top for thereception of engagement with 9 0 'taching lug 9 is engagefd with thelocking the top of the lug 9,

prongs "ofthe brake head fit snugly into the depressions between thespacing ribs 6 and the central holding lug, so that said ribs inconjunction with the lug will prevent twisting movement of the shoe.

Adjacent the ends of the shoe and beyond the extremity of the brake headend prongs, are formed theend locking lugs 11, the side walls of theselugs being undercut to establish locking engagement with the undercutwalls of locking recesses formed on the face of a similarly shaped shoe.Nearer the center of the shoe and preferably midway be- .tween the endlocking lugs 11 and the cen tral locking lugs 7, I have provided lockinglugs 12 also having undercut side walls similarly to lugs 11. On thedrawings the lugs 12 are shown as being wider than the lugs 11 but itwill be obvious that the width of the lugs may be varied withinreasonable limits, as required. I

An undercut groove or recess 13 is formed centrally of the face of theshoe to receive and interlockingly engage with the central locking stud7 of a similarly shaped shoe. i Undercut grooves orrecesses 14 and 15are also provided on the face of the shoe, said grooves being spaced atrequisite distances from the central groove and being shaped to receiveand interlockingly engage with the locking lugs 12 and 11, respectivelyof a similar shoe. The locking lugs and the locking recesses arepreferably tapered slightly'in order-to facilitate the removal of thepattern-during the casting operation.

It will be observed that the lugs 11 and 12 do not extend entirelyacross the back of the shoe but terminate short of one side thereof andthat the grooves l3, l4 and 15 are open at one end to permit theentrance of the corresponding locking lugs and are closed at the otherend to prevent relative lateral displacement of the shoes in onedirection by reason of the engagement of the end of the locking lugswith the end walls of the grooves.

The shoes are fastened to the brake head with the closed ends of thelocking recesses or grooves disposed outwardly," the open ends of therecess lying adjacent the flange of the wheel which may be'relied uponto prevent lateral displacement of the attachlng shoe inwardlyl In orderto insure, however, against relative lateral displacement of theinterlocked shoes without the aid of the wheel flange, I have soarranged the locking lugs and cooperative recesses that any relativemovement between the shoes will have a tendency to draw them intoalinement rather than to cause a relative lateral displacement. consistsin forming the locking lugs 7, 11 and 12 with their longitudinal axesdisposed obliquely to the longitudinal axis of the shoe 65 and likewiseforming the locking recesses This arrangement 13, 14 and 15 with theirlongitudinal axes disposed obliquely to the longitudinal axis of theshoe. A

The shoe isfastened to a brake head with the open ends of the lockingrecesses above the closed ends so that when the locking lugs of anothershoe are introduced into the recesses the action of gravity will tend tourge the lugs into the recesses and against the closed ends thereof,thereby insuring alinementof the interlocked shoes and maintaining thefaceof the wearing shoe in. proper relation to the wheel. During theactual running of a car or locomotive equipped with shoes havingobliquely arranged locking lugs as described, the continual vibrationwill assist gravity in urging the locking lugs against the closed endsof the recesses and when the brake is applied, the downwardly moving g5tread of the wheel will further assist in drawing the interlocked shoestogether. Should the brake be applied to a wheelievolving in theopposite direction relatively to the shoe, 2'. e., with the tread of the0 wheel adjacent the shoe moving in an upward direction, the tendencywould, of course, be to lift the shoe engaged with the wheel. relativelyto the fixed shoe. The obliquity of the locking lugs and recesses is notgrea't'enough, even under these circum stances, to afiord a wedgingaction between the walls of therecesses and lugs sufiicient to displacethe shoe, and as soon as the brake is released, the locking lugs willagain seek 10:, the lower ends of the recesses.

From the foregoing it is believed that the construction, operation andmany advantages of ,the present invention, will be apparent withoutfurther description and it will be apparent that various changes in thesize, shape and proportion of the various parts may be resorted towithout departing. from the spirit of the invention or sacrificing anyof the material advantages thereof.

I claim:

1. An interlocking brake shoe comprising a body member provided with acentral locking lug, a pair of locking lugs spaced from said centrallug, and a second pair of locking lugs spaced from the ends of the shoebut lying beyond the extremities of the end prongs of a brake head.

2': An interlocking brake shoe comprising a body member having acentrally disposed locking lug adapted to be lockingly engaged with adetachable fastening lug, a locking lug spaced from the end of the shoe,and another lug positioned intermediate the cen 12 tral and end lockinglugs whereby the end prongs of a brake head are adapted to lie betweensaid end and intermediate lugs.

3. An interlocking *brake shoe comprising a body member provided on itsback with a 1 centrally disposed locking lug adapted to interlockinglyengage witha detachable fastening lug, and a pair of locking lugslocated near the ends of the shoe outside the 5. An interlocking brakeshoe comprising a bodymember provided on its back with locking lugsdisposed adjacent the ends thereof, a central locking lug adapted to beengaged by a detachable fastening lug, and intermediate locking lugsdisposed between; said central and end lugs and having on its facelocking recesses adapted to receive the locking lugs of a similarlyshaped shoe.

6. A brake shoe comprising a body member provided on its back with aplurality of lugs arranged obliquely relativelyto the longitudinal axisof the shoe, one end of the lugs lying flush with the side of the bodymember, the other end terminating short of the opposite side of saidmember.

7 A brake shoe comprising a body mem ber provided on its face with aplurality o'f recesses arranged obliquely relatively to the longitudinalaxis of the shoe, said recesses extending partially across the shoe andbeing open at one end and closed at the other.

8. An interlocking brake shoe provided on its back with a plurality'oflocking lugs extending from one side thereof nearly to the other sideand on its face with a plurality of locking recesses open-at one end andclosed at the other end adapted to receive the locking lugs on asimilarly shaped shoe,

said lugs and recesses being disposed obliquely relatively to thelongitudinal axis of the shoe.

9. An interlocking brake shoe comprising a body member provided on itsback with a plurality of locking lugs extending partially across theshoeparallelly arranged and disposed obliquely tothe longitudinal axis ofthe shoe, and having a plurality of locking recesses formed on its faceand extending partially across the shoe to receive and interlockinglyengage withthe locking lugs on a similar shoe; 10. A brake shoecomprising a body member having a centrally disposed locking. lug *onits back, the ends of said lug being adapt ed for interlockingengagement with a debeing disposed obliquely to the longitudinal axis ofthe shoe.

11. A brake shoe comprising a body mem-- her having a locking lugterminating short of the sides of the shoe and disposed centrally on itsback, the ends of said lug lying parallel with the longitudinal axis ofthe shoe and the sides being disposed obliquely relatively to said axis.e

' 12. A brake shoe comprising a body member provided on its back with acentrally disposed locking lug, said lug having its ends disposedparallel with the longitudinal axis 'tachable attaching lug and thesides thereof of the shoe and undercut to be lockingly en-.-

gaged with a-det-achable attaching lug and having its sides disposedobliquely to the longitudinal axis of the shoe and undercut to interlockwith a locking recess on the face of asimilar shoe. v

- CHARLES W. ARMBRUST Witnesses: V e

, IRA J .-W1LsoN',

M. Ronnn'rson.

five cents each, by addressing the '(lommlssioner of Patents,

Washington, D. 0.

